package com.design.pattern.designPrinciples.liskovSubstitution;/** * create by yufeng on 2021/7/3 16:10 */public class Square implements QuadRangle {    private long length;    public long getLength() {        return length;    }    public void setLength(long length) {        this.length = length;    }    public long getWidth() {        return length;    }    public long getHeight() {        return length;    }}